I don't think a tradition is invented - it starts off as a why don't we and then is done again because it seemed like good fun, and in a generation it might be a tradition - by which time the neighbours have all joined in because it seems like fun.

What the tradition is might become a matter opinion, and the original perpetrators might not recognise it by the time the second generation comes to take it up, but traditions evolve - and they always seem to go along the lines of being good fun, or getting drunk and similar passtimes.